diff --git a/library/bme680/__init__.py b/library/bme680/__init__.py
index df65555..92c541b 100644
--- a/library/bme680/__init__.py
+++ b/library/bme680/__init__.py
@@ -51,6 +51,7 @@ class BME680(BME680Data):
         self._get_calibration_data()
 
         self.set_temp_offset(0)
+        self.ambient_temperature = 25 # only for gas heater temperature, nearly irrelevant
 
     def _get_calibration_data(self):
         """Retrieve the sensor calibration data and store it in .calibration_data."""